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G! MoGORD. Hot Air Furnace.

No. 242,549., Patented June 7, 1881.

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NITED STATES PATENT OFFIC GEORGE MCOORD, OF NEW YORK, N. Y.

HOT-AIR FURNACE.

SPECIFICATION forming part of Letters Patent No. 242,549, dated June 7, 1881.

Application filed February 24, 1881.

To all whom it may concern Be it known that I, GEORGE McOonD, of the city, county, and State of New York, have invented new and useful Improvements in Hot- Air Furnaces, of which the following is a specification.

This invention has for its object the saving of heat usually lost by radiation, and at the same time keeping the cellar at a proper degree of temperature, so that vegetables of various kinds will not be spoiled by the usual highdegree of temperature caused by furnaces in such places; and the invention consists in furnishing a non-radiating covering to the furnace proper, so that an air-space is provided between the furnace and the ordinary brick inclosure, and of such a character that the said covering will prevent the heat from radiating to the brick walls outside of the furnace, and in combinin g a cold-air conduit and a valve with the said outer casing and the brick inclosure, so that a certain degree of temperature may be maintained at all times in the said cellar or basement as will hereinafter appear.

In the drawings, Figure 1 represents a plan of the entire apparatus. Fig. 2 is a vertical section of the same.

At A is shown the furnace proper, with a coal-chute at B and a smoke-pipe at O.

Ordinarily such furnaces are inclosed in a chamber made of brick, as represented at D, and from said chamber the pipes lead to the different rooms or places to be heated, and the consequence of such aconstruction is that the walls of said chamber soon become so heated that the cellar is practically worthless as a store-room for green fruits and vegetables, &c. To remedy this difficulty I surround the furnace proper, or the heater, with a shield or covering, preferably of sheet metal, as represented at E, and of sufficient size to nearly fill the brick chamber, thereby leaving a narrow space between the said shield and the inner faces of the walls of the brick-work. Said shield is made in sections, as represented in the plan, and the edges of the sections may be formed, as represented, by a tongue-and-groove joint and fastened by screws, as at F, so that the parts may be removed when repairs are required for the furnace. The cover of said (No model.)

shield is also made loose and formed with a flange, as at Gr, to fit down over the top of the lining, like a lid on a metal can, and from this cover the hot-air-pipe connections are made in the ordinary manner. Near or toward the center of said cover, on its under side, are fastened deflecting-plates, as shown at H, to throw the heat rising from the furnace toward the hot-air pipes.

To properly control the temperature in the space between the brick walls and the said. shield or casing a small perforated air-pipe, K, is connected with the pipe that supplies the furnace-chamber with cold air, as at L, and a valve, as at M, to regulate the supply of cold air to the said perforated pipe, and which is laid in the bottom of the space, between the shield and the brick-work, and then it extends up in one corner and to a point outside of the brick chamber, where it has an outlet in the cellar. By such an arrangement it will be seen that a small quantity of cold air may be evenly distributed in the said space, and when allowed to escape may thereby keep the temperature in the cellar at a properly regulated degree of heat, and Whenever itis warm enough the supply of air to the perforated pipe may be stopped by the valve.

An opening, as at Npmay be formed in one side of the shield or casing, as indicated by the dotted lines, so that a person may enter the casing to repair the furnace, and this may be provided with a shutter similar to the one for closing the entrance to the brick chamber, as shown at O in the drawings. Said shield or casin g will be found to bemost useful when made of sheet-tin or galvanized sheet-iron, though it may be formed of cast-metal plates and fitted in sections, as represented.

It is evident that instead of the outer casing of brick-work a metal casing may be used, as is often the case. In such arrangement the shield or casing must be inserted between them to form the cold-air space.

Having thus fully described my invention, I desire to claim In a hot-air furnace constructed with a shield or casing between the furnace proper and the outer chamber to form an outer airspace, as described, a perforated pipe placed in the lower portion of said outer air-space, my hand in the presence of two subscribing provided with a regulating-valve, and ooxnwitnesses. munieating with the external atmosphere,

whereby the air-space is at all times kept cool, GEORGE and. the heating'of the brick or other inclosing- Witnesses: chamber is prevented. EUGENE N. ELIOT,

In testimony whereof I have hereunto set THos. A. OONNERY. 

